whats going on?

just need abit off advice, im a ftm and for the past 4 hours ive been having pains. they start near my belly button right around to my back. sometimes they start at my back first and then round to my belly button... i will be 39 weeks tomorrow... they are very sore but bearable and only last around 7 seconds... they come back every 20/30 mins so its not constant.. any advice would be great... i also feel sick like i need to throw up but that comes and goes aswell